Observable Universe And Unknown Universe, Does The Universe Edge Exist?
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The universe is a really interesting place, but let me ask you...where does it end? Where is the literal edge that we can't get beyond? Join us as we explore the question, "Where is the edge of the universe?"
8. How Do We Define The "Edge of the Universe"?
I know this may sound like an easy question, but trust me when I say that it honestly isn't. And some of it is for reasons that we'll discuss a little later on in the video. But one of the reasons we need to ask this question is that there are some people who don't know if there is an actual edge to the universe at all.
After all, to have an "edge" would mean that you are a shape or object that is actually capable of having an edge. And for a long time, a lot of people felt that the universe was a flat long object. But, recently, some theories have been circulating that the universe might actually be a sphere, which means that there is no "Edge" but rather an "outline" of the universe, which of course would change every known theory about the universe as a whole.
To be clear, this wasn't just any "random idea" that came about. Rather, it came from a study of a lot of significant data. Specifically, they looked at the Cosmic Microwave Background, also known as the CMB. What is CMB? Well, it's:
"The remnant light from the big bang, and it is the most distant light we can see in the universe. Because of this, it is the light most affected by the shape of the universe. The scale of fluctuations in the CMB is determined by the amount of dark matter and dark energy in the universe, which we know, so we know how large the fluctuations should appear."
These fluctuations of light have helped scientists in many ways over the years, and this new team looked at the fluctuations and noticed something very strange. Because the data from the Plank spacefraft indicated that the fluctuations of the CMB was much, MUCH more than it would've been. So, if the universe was flat, these fluctuations would not be possible. Or at the very least not to the extent that they are right now. Thus, this new study seems to show that the universe is more rounded than we earlier expected.
So if the universe is a sphere, how can we look for a single edge when technically that would be any point along a circular outline?
Well...let's not get too crazy with it, ok? Let's just say for this video that we're looking for the place where the universe ends and there's nothing beyond that. So how do we search for that? Simple, we start at the beginning of it all in the eyes of many.
7. The Big Bang
As is somewhat of a tradition here on Earth, there are many beliefs and theories as to who or what created the universe. But in terms of science, and the people who live in this "realm", they believe that a massive explosio* of energy and matter created the universe as we know it. Now, obviously, just because that explosio* happened means that life and the universe as we know it was fully formed, far from it in fact.
You see, most scientists agree that after everything 'settled down' from the massive explosio* that created it that things began to grow, expand, evolve, and of course, change. For example, it may seem logical to an extent that the growth of Earth came rather quickly, but that's not the case. Earth took billions of years according to scientists to get just the most basic of life made, and then it took billions of years more to get to where we are now.
The same goes for the rest of the universe. Because while it may seem easy to think that everything just "settled down" after the big explosio* that created everything, that's not likely. The edge of the